History of the Peloponnesian War

Upon the envoys speaking in the senate upon these points, and stating that they had come with full powers to settle all others at issue between them, Alcibiades became afraid that if they were to repeat these statements to the popular assembly, they might gain the multitude, and the Argive alliance might be rejected,

and accordingly had recourse to the following stratagem. He persuaded the Lacedaemonians by a solemn assurance that if they would say nothing of their full powers in the assembly, he would give back Pylos to them (himself, the present opponent of its restitution, engaging to obtain this from the Athenians), and would settle the other points at issue.

His plan was to detach them from Nicias and to disgrace them before the people, as being without sincerity in their intentions, or even common consistency in their language, and so to get the Argives, Eleans, and Mantineans taken into alliance.